Appeal No. 1997-0448
Application No. 08/327,980
B. separating the soluble molybdic oxide from the insoluble molybdenum
trioxide;
C. contacting the insoluble molybdenum trioxide with at least one of lime
and magnesium hydroxide to form a mixture containing soluble
molybdate values;
D. combining the mixture of step C with the soluble molybdic oxide
fraction of step B to form a mixture of soluble molybdenum values;
E. contacting the aqueous mixture of step D with an organic solvent
containing an extractive compound that is selective for the molybdenum
values such that a majority of the metal contaminants remain in the
aqueous mixture while a majority of the molybdenum values are
extracted into the organic solvent;
F. removing the extracted molybdenum values of step E from the organic
solvent with an aqueous solution containing a stripping reagent selective
for molybdenum values;
G. crystallizing the extracted molybdenum values of step F; and
H. calcining the crystallized molybdenum values of step G to form
molybdenum trioxide of at least technical grade.
The references relied on by the examiner are:
Chiola et al. (Chiola) 3,598,519 Aug. 10, 1971
Barry et al. (Barry) 3,656,888 Apr. 18, 1972
Vertes et al. (Vertes) 4,046,852 Sep. 6, 1977
Sohn 4,376,647 Mar. 15, 1983
I.G. Farbenindustrie
Aktiengesellschaft (GB ‘472) 331,472 Jul. 3, 1930
(published Great Britain patent specification)
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